Q. No.BOD is
(1) Amount of oxygen taken by bacteria to survive in 100mL water
(2) Amount of oxygen taken by bacteria to oxidise organic matter in 1L of water
(3) Amount of oxygen taken by bacteria to oxidise inorganic matter in 100mL of water
(4) Amount of oxygen evolved by bacteria to oxidise organic matter of 1L water
(1) Amount of oxygen taken by bacteria to survive in 100mL water
(2) Amount of oxygen taken by bacteria to oxidise organic matter in 1L of water
(3) Amount of oxygen taken by bacteria to oxidise inorganic matter in 100mL of water
(4) Amount of oxygen evolved by bacteria to oxidise organic matter of 1L water
Which of the following is not indicated by BOD test?
(1) Rate of uptake of oxygen by microorganisms in a sample of water
(2) A measure of organic matter present in the water
(3) Polluting potential
(4) Amount of Flocs
The bacterial Flocs of sewage treatment plants are allowed to settle in
(1) Primary Settling Tank
(2) Aeration Tank
(3) Activated sludge
(4) Secondary Settling tank
Activated sludge is
(1) Sedimented bacterial Flocs
(2) Bacterial Flocs of aeration tank
(3) Anaerobic sludge
(4) Effluent of primary settling tank
The activated sludge is
(1) Pumped back into aeration tanks
(2) Pumped into large anaerobic sludge digesters
(3) Pumped into primary settling tank
(4) Both A and B
The major part of activated sludge is sent to
(1) Anaerobic sludge digesters
(2) Aerobic sludge digesters
(3) Aeration tank
(4) Settling tank
From secondary settling tanks what is used as inoculum for primary settling tanks?
(1) Activated sludge
(2) Anaerobic bacteria
(3) Fungal Filaments
(4) Biogas
In anaerobic sludge digesters, the anaerobic bacteria
(1) Digest Fungi
(2) Digest Bacteria
(3) Both A and B
(4) Digest the organic matter
Methane, Hydrogen sulfide and carbon dioxide are produced in
(1) Aerobic settling tanks
(2) Anaerobic sludge digesters
(3) Aeration tanks
(4) Primary settling tanks
Which of the following is released into natural water bodies like rivers and streams?
(1) Effluent of primary treatment
(2) Effluent of secondary treatment
(3) Settling component of secondary treatment
(4) Settling component of primary treatment
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